HRP20211700T1 - Image decoding device, image decoding method, and image decoding program - Google Patents

Image decoding device, image decoding method, and image decoding program Download PDF

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HRP20211700T1
HRP20211700T1 HRP20211700TT HRP20211700T HRP20211700T1 HR P20211700 T1 HRP20211700 T1 HR P20211700T1 HR P20211700T T HRP20211700T T HR P20211700TT HR P20211700 T HRP20211700 T HR P20211700T HR P20211700 T1 HRP20211700 T1 HR P20211700T1
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mode
intraprediction
color difference
prediction
brightness
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HRP20211700TT
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Hiroya Nakamura
Motoharu Ueda
Shigeru Fukushima
Toru Kumakura
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Jvckenwood Corporation
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Priority claimed from JP2014023251A external-priority patent/JP6112031B2/en
Priority claimed from JP2014023252A external-priority patent/JP5907192B2/en
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Publication of HRP20211700T1 publication Critical patent/HRP20211700T1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/109—Selection of coding mode or of prediction mode among a plurality of temporal predictive coding modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • H04N19/463—Embedding additional information in the video signal during the compression process by compressing encoding parameters before transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques

Claims (3)

1. Uređaj za dekodiranje slike koji služi za dekodiranje informacija glede intrapredikcijskog načina rada u jedinici bloka predikcije i za dekodiranje slikovnih signala uključujući signal svjetline i signal razlike u boji u jedinici bloka konverzije uporabom intrapredikcije u skladu barem s plošnim načinom predikcije (0), prosječnim načinom predikcije (1) i mnoštvom kutnih predikcijskih načina rada (2-34) koji su raspoređeni uzduž horizontalne i vertikalne osi jedinice bloka konverzije, naznačen time, što posjeduje: - dekoder niza bitova (203) koji dekodira prvi element sintakse glede intrapredikcijskog načina rada signala svjetline iz niza bitova, u kojima informacije glede intrapredikcijskog načina rada svjetline pokazuju da je intrapredikcijski postupak predikcijskog bloka signala svjetline kodiran i izvodi intrapredikcijski način rada svjetline iz prvog elementa sintakse, i koji dekodira drugi element sintakse glede intrapredikcijskog načina rada razlike u boji od signala razlike u boji iz niza bitova u kojima informacije glede intrapredikcijskog načina rada razlike u boji pokazuju da je intrapredikcijski postupak predikcijskog bloka signala razlike u boji kodiran i izvodi prvi intrapredikcijski način rada razlike u boji iz drugog elementa sintakse i intrapredikcijskog načina rada svjetline; - intraprediktor signala svjetline (206) koji predviđa signal svjetline od konverzijskog bloka signala svjetline iz okružujućih signala svjetline konverzijskog bloka signala svjetline, u skladu s intrapredikcijskim načinom rada svjetline specificiranim za svaki predikcijski blok signala svjetline; i - intraprediktor signala razlike u boji (206) koji predviđa signal razlike u boji od konverzijskog bloka signala razlike u boji iz okružujućih signala razlike u boji konverzijskog bloka signala razlike u boji, u skladu s intrapredikcijskim načinom rada razlike u boji specificiranim za svaki predikcijski blok signala razlike u boji; pri čemu kada je format razlike u boji 4 : 2 : 2, dekoder niza bitova izvodi drugi intrapredikcijski način rada razlike u boji iz prvog intrapredikcijskog načina rada razlike u boji, na temelju predodređene konverzijske tablice, tako da, kada prvi intrapredikcijski način rada razlike u boji nije kutna predikcija, tada se broj načina rada (0, 1) od prvog intrapredikcijskog načina rada razlike u boji, koristi izravno kao broj načina rada od drugog intrapredikcijskog načina rada razlike u boji, i kada prvi intrapredikcijski način rada razlike u boji jest kutna predikcija koja ima broj načina rada (18-34) raspoređen na horizontalnoj osi, tada se drugi intrapredikcijski način rada razlike u boji, odabire tako da ima smjer predikcije u blizini kuta izvedenog putem skaliranja kuta smjera predikcije od prvog intrapredikcijskog načina rada razlike u boji u odnosu na vertikalni smjer pomoću faktora skaliranja od 1/2, i kada prvi intrapredikcijski način rada razlike u boji jest kutna predikcija koja ima broj načina rada (2-17) raspoređen na vertikalnoj osi, tada se drugi intrapredikcijski način rada razlike u boji, odabire tako da ima smjer predikcije u blizini kuta izvedenog putem skaliranja kuta smjera predikcije od prvog intrapredikcijskog načina rada razlike u boji u odnosu na horizontalni smjer pomoću faktora skaliranja od dva, i broj načina rada od drugog intrapredikcijskog načina rada razlike u boji, postavlja se pomoću zaokruživanja vrijednosti skaliranog kuta tako da odgovara smjeru broja načina rada, isključujući broj načina rada koji pokazuje vertikalnu predikciju (26), ako faktor skaliranja iznosi 1/2 i broj načina rada od prvog intrapredikcijskog načina rada razlike u boji nije broj načina rada koji pokazuje vertikalnu predikciju, i broj načina rada od drugog intrapredikcijskog načina rada razlike u boji, postavlja se tako da bude jednak broju načina rada koji pokazuje horizontalnu predikciju (10), ako je broj načina rada od prvog intrapredikcijskog načina rada razlike u boji, broj načina rada koji pokazuje horizontalnu predikciju.1. An image decoding device that serves to decode information regarding the intraprediction mode in the prediction block unit and to decode image signals including the brightness signal and the color difference signal in the conversion block unit using intraprediction in accordance with at least the planar prediction mode (0), average prediction mode (1) and a plurality of angular prediction modes (2-34) which are distributed along the horizontal and vertical axes of the conversion block unit, indicated by the fact that it has: - a bit string decoder (203) which decodes the first syntax element regarding the intraprediction mode of operation of the brightness signal from the string of bits, in which the information regarding the intraprediction mode of operation of the brightness shows that the intraprediction procedure of the prediction block of the brightness signal is coded and derives the intraprediction mode of operation of the brightness from the first element of the syntax , and which decodes the second intraprediction color difference mode syntax element from the color difference signal from a sequence of bits in which the color difference intraprediction mode information indicates that the intraprediction process of the color difference signal prediction block is encoded and performs the first intraprediction mode color differences from the second element of the syntax and intraprediction brightness mode; - brightness signal intrapredictor (206) which predicts the brightness signal from the brightness signal conversion block from the surrounding brightness signals of the brightness signal conversion block, in accordance with the brightness intraprediction mode specified for each brightness signal prediction block; and - a color difference signal intrapredictor (206) which predicts the color difference signal from the color difference signal conversion block from the surrounding color difference signals of the color difference signal conversion block, in accordance with the color difference intraprediction mode specified for each prediction signal block color differences; whereby when the color difference format is 4 : 2 : 2, the bitstream decoder derives the second intraprediction color difference mode from the first intraprediction color difference mode, based on a predetermined conversion table, so that, when the first intraprediction color difference mode is not angular prediction, then the mode number (0, 1) of the first intraprediction color difference mode is used directly as the mode number of the second intraprediction color difference mode, and when the first color difference intraprediction mode is an angle prediction that has the number of modes (18-34) distributed on the horizontal axis, then the second color difference intraprediction mode is selected so that it has a prediction direction near the angle derived through direction angle scaling predictions from the first intraprediction color difference mode with respect to the vertical direction using a scaling factor of 1/2, and when the first intraprediction color difference mode is an angle prediction that has the number of modes (2-17) distributed on the vertical axis, then the second intraprediction color difference mode is selected to have a prediction direction near the angle derived through direction angle scaling predictions from the first intraprediction color difference mode in relation to the horizontal direction using a scaling factor of two, i the mode number from the second intraprediction color difference mode, is set by rounding the scaled angle value to match the direction of the mode number, excluding the mode number showing vertical prediction (26), if the scaling factor is 1/2 and the mode number from the first intraprediction color difference mode is not the number of modes showing vertical prediction, and the number of modes from the second intraprediction color difference mode is set to be equal to the number of modes showing horizontal prediction (10), if the number of modes from the first intraprediction color difference mode is the number of modes showing horizontal prediction . 2. Postupak za dekodiranje slike koji služi za dekodiranje informacija glede intrapredikcijskog načina rada u jedinici bloka predikcije i za dekodiranje slikovnih signala uključujući signal svjetline i signal razlike u boji u jedinici bloka konverzije uporabom intrapredikcije u skladu barem s plošnim načinom predikcije (0), prosječnim načinom predikcije (1) i mnoštvom kutnih predikcijskih načina rada (2-34) koji su raspoređeni uzduž horizontalne i vertikalne osi jedinice bloka konverzije, naznačen time, što obuhvaća: - dekodiranje prvog elementa sintakse glede intrapredikcijskog načina rada signala svjetline iz niza bitova u kojima informacije glede intrapredikcijskog načina rada svjetline pokazuju da je intrapredikcijski postupak predikcijskog bloka signala svjetline kodiran i izvodi intrapredikcijski način rada iz prvog elementa sintakse; - dekodiranje drugog elementa sintakse glede intrapredikcijskog načina rada razlike u boji od signala razlike u boji iz niza bitova u kojima informacije glede intrapredikcijskog načina rada razlike u boji pokazuju da je intrapredikcijski postupak predikcijskog bloka signala razlike u boji kodiran i izvodi prvi intrapredikcijski način rada razlike u boji iz drugog elementa sintakse i intrapredikcijskog načina rada svjetline; - predikciju signala svjetline od konverzijskog bloka signala svjetline iz okružujućih signala svjetline konverzijskog bloka signala svjetline, u skladu s intrapredikcijskim načinom rada svjetline specificiranim za svaki predikcijski blok signala svjetline; i - predikciju signala razlike u boji od konverzijskog bloka signala razlike u boji iz okružujućih signala razlike u boji od konverzijskog bloka signala razlike u boji, u skladu s intrapredikcijskim načinom rada razlike u boji specificiranim za svaki predikcijski blok signala razlike u boji; pri čemu kada je format razlike u boji 4 : 2 : 2, dekoder niza bitova izvodi drugi intrapredikcijski način rada razlike u boji iz prvog intrapredikcijskog načina rada razlike u boji, na temelju predodređene konverzijske tablice, tako da kada prvi intrapredikcijski način rada razlike u boji nije kutna predikcija, tada se broj načina rada (0, 1) od prvog intrapredikcijskog načina rada razlike u boji, koristi izravno kao broj načina rada od drugog intrapredikcijskog načina rada razlike u boji, i kada prvi intrapredikcijski način rada razlike u boji jest kutna predikcija koja ima broj načina rada (18-34) raspoređen na horizontalnoj osi, tada se drugi intrapredikcijski način rada razlike u boji, odabire tako da ima smjer predikcije u blizini kuta izvedenog putem skaliranja kuta smjera predikcije od prvog intrapredikcijskog načina rada razlike u boji u odnosu na vertikalni smjer pomoću faktora skaliranja od 1/2, i kada prvi intrapredikcijski način rada razlike u boji jest kutna predikcija koja ima broj načina rada (2-17) raspoređen na vertikalnoj osi, tada se drugi intrapredikcijski način rada razlike u boji, odabire tako da ima smjer predikcije u blizini kuta izvedenog putem skaliranja kuta smjera predikcije od prvog intrapredikcijskog načina rada razlike u boji u odnosu na horizontalni smjer pomoću faktora skaliranja od dva, i pritom se broj načina rada od drugog intrapredikcijskog načina rada razlike u boji, postavlja pomoću zaokruživanja vrijednosti skaliranog kuta tako da odgovara smjeru broja načina rada, isključujući broj načina rada koji pokazuje vertikalnu predikciju (26), ako faktor skaliranja iznosi 1/2 i broj načina rada od prvog intrapredikcijskog načina rada razlike u boji nije broj načina rada koji pokazuje vertikalnu predikciju, i broj načina rada od drugog intrapredikcijskog načina rada razlike u boji, postavlja se tako da bude jednak broju načina rada koji pokazuje horizontalnu predikciju (10), ako je broj načina rada od prvog intrapredikcijskog načina rada razlike u boji, broj načina rada koji pokazuje horizontalnu predikciju.2. An image decoding method for decoding information regarding the intraprediction mode in the prediction block unit and for decoding image signals including the luminance signal and the color difference signal in the conversion block unit using intraprediction in accordance with at least the planar prediction mode (0), average prediction mode (1) and a plurality of angular prediction modes (2-34) which are distributed along the horizontal and vertical axes of the conversion block unit, indicated by the fact that it includes: - decoding of the first syntax element regarding the intraprediction mode of operation of the brightness signal from a series of bits in which the information regarding the intraprediction mode of operation of the brightness shows that the intraprediction procedure of the prediction block of the brightness signal is coded and performs the intraprediction mode of operation from the first element of the syntax; - decoding of the second syntax element regarding the intraprediction mode of operation of the color difference from the color difference signal from a series of bits in which the information regarding the intraprediction mode of operation of the color difference indicates that the intraprediction procedure of the prediction block of the color difference signal is coded and performs the first intraprediction mode of operation of the difference in colors from the second element of the syntax and intraprediction brightness mode; - prediction of the brightness signal from the brightness signal conversion block from the surrounding brightness signals of the brightness signal conversion block, in accordance with the intraprediction brightness mode specified for each brightness signal prediction block; and - prediction of the color difference signal from the color difference signal conversion block from the surrounding color difference signals from the color difference signal conversion block, in accordance with the color difference intraprediction mode specified for each color difference signal prediction block; whereby when the color difference format is 4 : 2 : 2, the bitstream decoder derives the second intraprediction color difference mode from the first intraprediction color difference mode, based on the predetermined conversion table, so that when the first intraprediction color difference mode is not angular prediction, then the mode number (0, 1) of the first intraprediction color difference mode is used directly as the mode number of the second intraprediction color difference mode, and when the first color difference intraprediction mode is an angle prediction that has the number of modes (18-34) distributed on the horizontal axis, then the second color difference intraprediction mode is selected so that it has a prediction direction near the angle derived through direction angle scaling predictions from the first intraprediction color difference mode with respect to the vertical direction using a scaling factor of 1/2, and when the first intraprediction color difference mode is an angle prediction that has the number of modes (2-17) distributed on the vertical axis, then the second intraprediction color difference mode is selected to have a prediction direction near the angle derived through direction angle scaling predictions from the first intraprediction color difference mode in relation to the horizontal direction using a scaling factor of two, and the mode number from the second intraprediction color difference mode is set by rounding the scaled angle value to match the direction of the mode number, excluding the mode number showing vertical prediction (26), if the scaling factor is 1/2 and the mode number from the first intraprediction color difference mode is not the number of modes showing vertical prediction, and the number of modes from the second intraprediction color difference mode is set to be equal to the number of modes showing horizontal prediction (10), if the number of modes from the first intraprediction color difference mode is the number of modes showing horizontal prediction . 3. Program za dekodiranje slike koji služi za dekodiranje informacija glede intrapredikcijskog načina rada u jedinici bloka predikcije i za dekodiranje slikovnih signala uključujući signal svjetline i signal razlike u boji u jedinici bloka konverzije uporabom intrapredikcije u skladu barem s plošnim načinom predikcije (0), prosječnim načinom predikcije (1) i mnoštvom kutnih predikcijskih načina rada (2-34) koji su raspoređeni uzduž horizontalne i vertikalne osi jedinice bloka konverzije, pri čemu je program za dekodiranje slike naznačen time, što uzrokuje da računalo izvršava: - dekodiranje prvog elementa sintakse glede intrapredikcijskog načina rada signala svjetline iz niza bitova u kojima informacije glede intrapredikcijskog načina rada svjetline pokazuju da je intrapredikcijski postupak predikcijskog bloka signala svjetline kodiran i izvodi intrapredikcijski način rada svjetline iz prvog elementa sintakse; - dekodiranje drugog elementa sintakse glede intrapredikcijskog načina rada razlike u boji od signala razlike u boji iz niza bitova u kojima informacije glede intrapredikcijskog načina rada razlike u boji pokazuju da je intrapredikcijski postupak predikcijskog bloka signala razlike u boji kodiran i izvodi prvi intrapredikcijski način rada razlike u boji iz drugog elementa sintakse i intrapredikcijskog načina rada svjetline; - predikciju signala svjetline od konverzijskog bloka signala svjetline iz okružujućih signala svjetline od konverzijskog bloka signala svjetline, u skladu s intrapredikcijskim načinom rada svjetline specificiranim za svaki predikcijski blok signala svjetline; i - predikciju signala razlike u boji od konverzijskog bloka signala razlike u boji iz okružujućih signala razlike u boji od konverzijskog bloka signala razlike u boji, u skladu s intrapredikcijskim načinom rada razlike u boji specificiranim za svaki predikcijski blok signala razlike u boji; pri čemu kada je format razlike u boji 4 : 2 : 2, dekoder niza bitova izvodi drugi intrapredikcijski način rada razlike u boji iz prvog intrapredikcijskog načina rada razlike u boji, na temelju predodređene konverzijske tablice, tako da kada prvi intrapredikcijski način rada razlike u boji nije kutna predikcija, tada se broj načina rada (0, 1) od prvog intrapredikcijskog načina rada razlike u boji, koristi izravno kao broj načina rada od drugog intrapredikcijskog načina rada razlike u boji, i kada prvi intrapredikcijski način rada razlike u boji jest kutna predikcija koja ima broj načina rada (18-34) raspoređen na horizontalnoj osi, tada se drugi intrapredikcijski način rada razlike u boji, odabire tako da ima smjer predikcije u blizini kuta izvedenog putem skaliranja kuta smjera predikcije od prvog intrapredikcijskog načina rada razlike u boji u odnosu na vertikalni smjer pomoću faktora skaliranja od 1/2, i kada prvi intrapredikcijski način rada razlike u boji jest kutna predikcija koja ima broj načina rada (2-17) raspoređen na vertikalnoj osi, tada se drugi intrapredikcijski način rada razlike u boji, odabire tako da ima smjer predikcije u blizini kuta izvedenog putem skaliranja kuta smjera predikcije od prvog intrapredikcijskog načina rada razlike u boji u odnosu na horizontalni smjer pomoću faktora skaliranja od dva, i broj načina rada od drugog intrapredikcijskog načina rada razlike u boji, postavlja se pomoću zaokruživanja vrijednosti skaliranog kuta tako da odgovara smjeru broja načina rada, isključujući broj načina rada koji pokazuje vertikalnu predikciju (26), ako faktor skaliranja iznosi 1/2 i broj načina rada od prvog intrapredikcijskog načina rada razlike u boji nije broj načina rada koji pokazuje vertikalnu predikciju, i pritom se broj načina rada od drugog intrapredikcijskog načina rada razlike u boji, postavlja tako da bude jednak broju načina rada koji pokazuje horizontalnu predikciju (10), ako je broj načina rada od prvog intrapredikcijskog načina rada razlike u boji, broj načina rada koji pokazuje horizontalnu predikciju.3. An image decoding program that serves to decode information regarding the intraprediction mode in the prediction block unit and to decode image signals including the brightness signal and the color difference signal in the conversion block unit using intraprediction in accordance with at least the flat prediction mode (0), average a prediction mode (1) and a plurality of angular prediction modes (2-34) arranged along the horizontal and vertical axes of the conversion block unit, wherein the image decoding program is indicated as causing the computer to execute: - decoding of the first syntax element regarding the intraprediction mode of operation of the brightness signal from a series of bits in which the information regarding the intraprediction mode of operation of the brightness shows that the intraprediction procedure of the prediction block of the brightness signal is coded and performs the intraprediction mode of operation of the brightness from the first element of the syntax; - decoding of the second syntax element regarding the intraprediction mode of operation of the color difference from the color difference signal from a series of bits in which the information regarding the intraprediction mode of operation of the color difference indicates that the intraprediction procedure of the prediction block of the color difference signal is coded and performs the first intraprediction mode of operation of the difference in colors from the second element of the syntax and intraprediction brightness mode; - prediction of the brightness signal from the brightness signal conversion block from the surrounding brightness signals from the brightness signal conversion block, in accordance with the intraprediction brightness mode specified for each brightness signal prediction block; and - prediction of the color difference signal from the color difference signal conversion block from the surrounding color difference signals from the color difference signal conversion block, in accordance with the color difference intraprediction mode specified for each color difference signal prediction block; whereby when the color difference format is 4 : 2 : 2, the bitstream decoder derives the second intraprediction color difference mode from the first intraprediction color difference mode, based on the predetermined conversion table, so that when the first intraprediction color difference mode is not angular prediction, then the mode number (0, 1) of the first intraprediction color difference mode is used directly as the mode number of the second intraprediction color difference mode, and when the first color difference intraprediction mode is an angle prediction that has the number of modes (18-34) distributed on the horizontal axis, then the second color difference intraprediction mode is selected so that it has a prediction direction near the angle derived through direction angle scaling predictions from the first intraprediction color difference mode with respect to the vertical direction using a scaling factor of 1/2, and when the first intraprediction color difference mode is an angle prediction that has the number of modes (2-17) distributed on the vertical axis, then the second intraprediction color difference mode is selected to have a prediction direction near the angle derived through direction angle scaling predictions from the first intraprediction color difference mode in relation to the horizontal direction using a scaling factor of two, i the mode number from the second intraprediction color difference mode, is set by rounding the scaled angle value to match the direction of the mode number, excluding the mode number showing vertical prediction (26), if the scaling factor is 1/2 and the mode number from the first intraprediction mode of the color difference is not the number of the mode that shows the vertical prediction, and at the same time the number of modes from the second intraprediction color difference mode, set to be equal to the number of modes showing horizontal prediction (10), if the number of modes from the first intraprediction color difference mode is the number of modes showing horizontal prediction.
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